Engine running switch/relay? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

biohazardbill · 01-23-2016, 11:20 PM

2000 c2500 with the 5.7. Looking for an electrical way to tell when the engine is running. Thought about the oil pressure switch but it is a 1 wire. No voltage there. Looking for other options without spending a lot of money.

TIA

**biketopia** · 01-29-2016, 11:09 AM

what are you trying to do? You could pull off the cam, crank or tach signal...if you're brave

_Ogre · 01-30-2016, 01:52 PM

you could always look at the tach

**VetteVet** · 01-30-2016, 04:19 PM

Quote:

Originally Posted by _Ogre

you could always look at the tach

^^^^ That looks like a CDowns post.

ray_mcavoy · 01-30-2016, 07:36 PM

^^ LOL

How about replacing the oil pressure switch with a 2-terminal one? Or adding a 2nd switch with a Tee fitting if you also need to retain the original switch.

With a 2-terminal oil pressure switch you can get one where the contacts are normally open and will close at a certain pressure. Like this one for example --> http://www.summitracing.com/parts/sm...Fc4YHwodEE0L9g I'm not sure if the threads on this switch will fit your application so you might need to look for a similar switch with suitable threads or use an adapter.

With that type of switch, you could run fused +12V to one terminal. And then connect the other terminal to your application that needs power only with the engine running. Or run it through a relay if there is high current involved.

01-23-2016, 11:20 PM	#1
biohazardbill Registered User Join Date: Jan 2010 Location: Forsyth, Ga Posts: 1,012	Engine running switch/relay? 2000 c2500 with the 5.7. Looking for an electrical way to tell when the engine is running. Thought about the oil pressure switch but it is a 1 wire. No voltage there. Looking for other options without spending a lot of money. TIA

01-29-2016, 11:09 AM	#2
biketopia Senior Member Join Date: Jul 2015 Location: Warrenton VA Posts: 1,117	Re: Engine running switch/relay? what are you trying to do? You could pull off the cam, crank or tach signal...if you're brave __________________ 71 c-10 Long Bed, under the knife for a No Limit Engineering Wide Ride Chassis Pack and coil over static drop. 07 Silverado Classic 2wd 95 Camaro 427SBC/TH350

01-30-2016, 01:52 PM	#3
_Ogre Registered User Join Date: Jan 2012 Location: Motown Posts: 7,680	Re: Engine running switch/relay? you could always look at the tach __________________ cool, an ogre smiley Ogre's 58 Truk build how to put your truck year and build thread into your signature shop air compressor timer

01-30-2016, 07:36 PM	#5
ray_mcavoy Registered User Join Date: Nov 2009 Location: Sherman, ME Posts: 2,373	Re: Engine running switch/relay? ^^ LOL How about replacing the oil pressure switch with a 2-terminal one? Or adding a 2nd switch with a Tee fitting if you also need to retain the original switch. With a 2-terminal oil pressure switch you can get one where the contacts are normally open and will close at a certain pressure. Like this one for example --> http://www.summitracing.com/parts/sm...Fc4YHwodEE0L9g I'm not sure if the threads on this switch will fit your application so you might need to look for a similar switch with suitable threads or use an adapter. With that type of switch, you could run fused +12V to one terminal. And then connect the other terminal to your application that needs power only with the engine running. Or run it through a relay if there is high current involved.

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